Question 1

In the following code snippet, what line of code should be inserted to declare a method named showInfo that outputs the string "Hi" to the console?

class A {

// insert code here

}

let a = new A();

console.log(a.showInfo());

Options :

A : let showInfo = function() { console.log("Hi"); }

B : showInfo = function() { return "Hi"; }

C : showInfo() { return "Hi"; }

D : function showInfo() { return "Hi"; }

Answer: B

Question 2

What is the output of the following code?

const add = (a, b) => a + b;

const double = n => add(n, n);

console.log(double(3));

Options :

A : 6

B : 9

C : 12

D : 15

Answer: A

Question 3

What will appear on the console after executing the following code?

let car = { model: "Tesla", year: 2022 };

let vehicle = {...car, color: "red"};

car.year = 2021;

console.log(`${vehicle.model} ${vehicle.year} ${vehicle.color}`);

Options :

A : Tesla 2021 red

B : Tesla 2022 red

C : Tesla 2021 blue

D : Tesla 2022 black

Answer: B

Question 4

What will be the value of result after the following code is executed?

var num1 = 10;

var num2 = 20;

var result = (num2 === 20) ? "yes" : "no";

Options :

A : 10

B : 20

C : "yes"

D : "no"

Answer: C

Question 5

What is the correct output of the following code:

var obj = {

value: 10

};

var foo = function() {

console.log(this.value);

};

var bar = function() {

console.log(this.value);

};

var boundFoo = foo.call(obj);

var boundBar = bar.bind(obj)();

console.log(boundFoo === boundBar);

Options :

A : 10 10 false

B : 10 undefined false

C : 10 10 true

D : undefined 10 false

Answer: C

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